chem

of cesium, Cs, hafnium, Hf, and gold, Au, which element has the smallest atomic radius? explain in terms of trends in periodic table?
also which element is most electronegative among C, N, O, Br and S? Which group does it belong to?

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  1. Gold because it has the most positive electrons in that period to keep the orbits of the electrons closer to the nucleus.

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